Plastic composition



UNITED STATES ELIEL L. SHARPNECK, OF BAKERSFIELD, CALIFORNIA.

ELASTIC COMPOSITION.

No Drawing.

To aZZwhomii'wmy concern:

Be it known that I, ELIEL L. SHARPNEGK, a citizen of the United States, residing at Bakersfield, in the county of Kern and State of California, have invented certain new and useful Improvements in Plastic Compositions, of which the following is a specification.

This invention relates to plastic compositions, and particularly to compositions to be used in paving roadways, streets, sidewalks, reservoir linings, building-blocks, and such other uses as the same may be applied to.

A further object is to providean improved composition for these purposes, of such material that the asphaltum, which forms one of the main ingredients, will be rendered resistant to the action of sun heat, this feature adding greatly to durability and especially to the lasting quality of roadby its use, roadways may be constructed at considerably less expense than the cost of concrete or other material ordinarily-used for that purpose. Other objects will appear in the course of the following description:

- This composition includes a finely divided filler which may consist of any soil,=sand, earthy matter or mixture thereof, prefer- ]ably and for most purposes, screened sand being used, to which a certain amount of Portland cement has been added. The filler is mixed with mineral asphaltum to which has been added a certain percentage of maglnesium chlorid.

To prepare the above composition, the

sand, if sand is used as a filler, is thoroughly screened so that the grains will be practically of uniform size and all coarse vegetable matter removed. -This screened sand is then heated and thoroughly dried to re- 7 move moisture before being mixed. In mixing, the filler is heated to a temperature of- 300 to 350 .degrees F., and while in this ,heated condition and beforetheasphalt is mixed with it, there is added Portland cement, The mineral asphaltum (which has Specification of Letters Patent.

Patented. May 24, 1921.

Application filed August 12, 1920. Serial No. 402,994.

' preferably 40 to 60 degrees penetration) is heated to the same temperature as the filler, that is to say: 300 to 850 degrees F., and when the asphaltum has attained the proper temperature there is added to it a certain percentage of magnesium chlorid which throws the asphalt into a high state Y of effervescence which increases the volume of asphalt several times, the asphalt and filler being mixed while the asphalt is efi'ervescing, and the mixing being continued until the mass is of a uniform black color, and while the mass is maintained at an approximate heat of 300 to 35.0 degrees F.

I do not wish to be limited to any particular'proportions of the ingredients above called for, as these proportions will vary under different screened sand filler, however, the best results are attained by using the materials in the following proportions:

Screened sand filler 86 per cent.

Asphaltum, to degrees penetration 8 per cent- Portland cement 5 per cent: Magnesium chlorid l per cent.

.For a filler consisting of earth, in which no sand is mixed, such as clay or other forms of like character, the proportions should be about as follows:

Earth filler 72. 5 per cent. Asphaltum 20. 0 per cent. Portland cement 5. 0 per cent. Magnesium chlorid 2. 5 per cent.

vmuch lower cost than a roadway having a surface of concrete -or other pavement formed in accordance with the ordinary formulas. It will also be noted that this mixture. orcomposition is of particular value in that the asphalt is not acted upon to any disadvantage by the heat of the sun. At the same time, the whole mass is rendered impervious to" water. Y

The heating of the fi er and of the other ingredients to 300 or 50 degrees F. while being mixed and applied, is of great importance, since heating operates to remove a large percentage of air included within the mass; and. thus when the mass is pressed circumstances. With a.

divided filler and Portland cement together into place by a roller, the particles will be forced into close contiguity with each other, and thus the density of the mass will be increased, rendering the resultant pavement very dense and hard.

lVhat I claim -is,

1. A plastic composition comprisingapproximately 73 to 86 per cent. of a finely divided filler, 8 to 20 per cent. of mineral asphaltum, 1 to 2% per cent. of magnesium chlorid and 5 per cent. of Portland cement.

2. A method of forming plastic compositions, which consists in mixing a finely and heating to a temperature of 300 to 3 50 15 degrees F., also heating mineral asphaltum v cence and while the mass is maintained at a temperature of 300 to 350 degrees F.

In testimony whereof, I have affixed my signature in presence of two Witnesses.

ELIEL L. SH'ARPNECK. Vitnesses:

HIRAM A. STURGES, ARTHUR H. STURGES. 

